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1. Re: [Amps] Zener Bias Replacement (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Tue, 07 Nov 2006 09:13:58 -0700; Tom, I measured some 1N4005 diodes this morning and got numbers similar to yours. The current to the diodes was applied for only a few seconds so heating effects from the diode current were not fully; /archives//html/Amps/2006-11/msg00104.html (9,743 bytes)
2. Re: [Amps] Buying Amp (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Wed, 29 Nov 2006 11:34:42 -0700; Jerry, I bought an Acom 1000 and have put 40,000 contacts on it. It still has the original tube with full output. I bought a spare tube but may never need it. I use the amp often in full QSK mode on; /archives//html/Amps/2006-11/msg00274.html (7,618 bytes)
3. [Amps] Vacuum Variable Capacitor Questions (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Fri, 22 Dec 2006 21:39:18 -0700; I have some known good vacuum variable capacitors that I would like to use in a couple of home made antenna tuners. The capacitors all hipot at more than the specs with leakages of only a few uA. How; /archives//html/Amps/2006-12/msg00205.html (6,851 bytes)
4. Re: [Amps] Alpha 87a (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 01 Jan 2007 17:40:02 -0700; Just a small clarification: A 3 dB pad will increase the return loss byt 2*3dB = 6dB. A 2.0:1 SWR is equivalent to a reflection coefficient of .333 and a return loss of 9.542dB. Therefore it takes a; /archives//html/Amps/2007-01/msg00011.html (8,552 bytes)
5. Re: [Amps] MOVs on HV PS (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 05 Mar 2007 15:43:56 -0700; I have several surge/RF filter devices made by Tripp-Lite and they have 3 MOVS in them. They also have UL/CSA rated caps across all 3 wires but the caps to the neutral line have smaller capacitance s; /archives//html/Amps/2007-03/msg00094.html (9,668 bytes)
6. Re: [Amps] MOVs on HV PS (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 05 Mar 2007 16:44:59 -0700; Jim, I read the article but didn't see where the 3 MOVs is major problem. The units I'm referring to are 120V/15A surge protectors with RF filtering. Give me a hint. 73, Larry, W0QE _________________; /archives//html/Amps/2007-03/msg00102.html (8,792 bytes)
7. [Amps] Doorknob capacitors (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Wed, 21 Mar 2007 17:10:39 -0600; Is there any reference someone could point me to concerning general ratings for doorknob type capacitors. I have several that are about 1.25 inches in diameter and 1 inch long with values of 270pF an; /archives//html/Amps/2007-03/msg00293.html (6,730 bytes)
8. Re: [Amps] Filter software (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Tue, 29 May 2007 12:30:47 -0600; Tom, The Elsie program by Jim Tonne is very good and free for up to 7 stage designs and $175 for up to 42 stage designs (I wish there was a cheaper version that could do up to 10 or 11 stage designs); /archives//html/Amps/2007-05/msg00247.html (8,140 bytes)
9. Re: [Amps] Re 200w fast relay (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Tue, 10 Jul 2007 10:41:10 -0600; Hi folks, I recently retired after many years designing telecom equipment and used the Aromat DS2 and DS2E relays extensively. The gear I designed probably used over 100 million of the relays in tota; /archives//html/Amps/2007-07/msg00158.html (10,466 bytes)
10. Re: [Amps] 200 Watt Fast Relay (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Tue, 10 Jul 2007 12:43:58 -0600; Bill, A lot of small relays especially with bifurcated contacts (2 contacts side by side with a small amount of give to each one) also have a minuscule amount of wiping between the contacts upon clos; /archives//html/Amps/2007-07/msg00166.html (7,937 bytes)
11. Re: [Amps] 50 Ohm Loads (score: 1): Author: "Larry Benko, W0QE" <xxw0qe@comcast.net>; Date: Tue, 13 Nov 2007 09:38:01 -0700; Caddock resistors are great www.caddock.com and are very good at high frequencies. The 100W ones come in TO-247 transistor type packages and are a resistance film fired onto a flat ceramic substrate.; /archives//html/Amps/2007-11/msg00188.html (8,753 bytes)
12. Re: [Amps] Relays (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sun, 30 Mar 2008 16:17:02 -0600; I was interested in the same topic a few years ago and I made a bunch of measurements on some Icom radios. Look at http://www.bnk.com/W0QE/Radio_Measurements/amplifier_timing.html Bottom line was for; /archives//html/Amps/2008-03/msg00374.html (11,314 bytes)
13. Re: [Amps] Silver Strap (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Tue, 08 Jul 2008 17:22:58 -0600; Folks, I used to think silver plating was a big deal until I ran a bunch of tests. See http://www.bnk.com/W0QE/inductor_Q_tests.html for the results. Silver is only 7% better than copper and with red; /archives//html/Amps/2008-07/msg00074.html (12,716 bytes)
14. Re: [Amps] Wire (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 28 Jul 2008 09:18:07 -0600; I had responded to Rich last week but I guess he either didn't like my answer or just wanted more opinions. Look at http://www.welchfluorocarbon.com/techdata.htm#Table1FluoropolymerSelectionGuide for; /archives//html/Amps/2008-07/msg00320.html (9,531 bytes)
15. Re: [Amps] Wire (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 28 Jul 2008 10:21:19 -0600; Carl, I can't say for sure but others have told me that cold flow was the primary reason it was used rather than Teflon. In aircraft usage, wires are bundled and lashed down so creep is a big deal if; /archives//html/Amps/2008-07/msg00331.html (11,755 bytes)
16. Re: [Amps] Closure on the Vacuum Relays, Plus... (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Thu, 11 Dec 2008 17:41:43 -0700; Phil, I have made several measurements on the keying of several Icom radios and the "hsend" line is timed incorrectly for the IC706 and IC7000 in that it goes away BEFORE the RF does. The 746/756 typ; /archives//html/Amps/2008-12/msg00198.html (9,101 bytes)
17. Re: [Amps] Closure on the Vacuum Relays, Plus... (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Fri, 12 Dec 2008 12:49:20 -0700; Jim, My Acom amp also will not drop the RF relay if RF is present. 73, Larry W0QE _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai; /archives//html/Amps/2008-12/msg00205.html (8,350 bytes)
18. [Amps] Breakdown voltages (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sat, 24 Jan 2009 17:43:05 -0700; Has anyone seen a study or have any knowledge of the relationship between the RF breakdown voltage and the 60Hz breakdown or DC breakdown voltage? I would like to test several parts such as switches,; /archives//html/Amps/2009-01/msg00285.html (6,680 bytes)
19. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sat, 28 Mar 2009 18:20:25 -0600; I'm pretty sure the "red" cores are type 2 powdered iron cores having a permeability of 10. Actually the cores are usually red on all sides but one which is brown. Larry, W0QE _______________________; /archives//html/Amps/2009-03/msg00520.html (8,552 bytes)
20. Re: [Amps] Asynchronous coax matching transformer (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sat, 01 Aug 2009 09:59:05 -0600; Hi Ian & Carl, Actually given only 50 ohm and 75 ohm coax and not paralleling any coax you can match all resistive impedances between 50 and 112.5 (75*75/50) ohms. e.g. 50 ohms -- 29.3 deg. 75 ohm co; /archives//html/Amps/2009-08/msg00005.html (8,709 bytes)

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